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Old 07-15-2008, 10:05 AM
BCW BCW is offline
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Losing Antifreeze after replacing EGR Valve

I have an 05 F350. I started have a lack of power last week driving from VA to OH when accelerating but ran fine at speed. I replaced the EGR Valve when I got to OH. It fixed the black smoke and lack of power issues. However now after replacing the EGR valve, I am having antifreeze loss. I cannot see any leaks anywhere. I have to add a little antifreeze every morning after short drives the day prior. My bottle has the new sticker on it for the fill line and I keep it at the min mark. I drove 380 miles yesterday, no overheating and this morning the bottle is empty. There are occasional white puffs of smoke, there is no evidence of antifreeze in the oil and other than the antifreeze loss it runs great. Does anyone have any ideas? Thanks
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Old 07-15-2008, 10:39 AM
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Originally Posted by BCW View Post
I have an 05 F350. I started have a lack of power last week driving from VA to OH when accelerating but ran fine at speed. I replaced the EGR Valve when I got to OH. It fixed the black smoke and lack of power issues. However now after replacing the EGR valve, I am having antifreeze loss. I cannot see any leaks anywhere. I have to add a little antifreeze every morning after short drives the day prior. My bottle has the new sticker on it for the fill line and I keep it at the min mark. I drove 380 miles yesterday, no overheating and this morning the bottle is empty. There are occasional white puffs of smoke, there is no evidence of antifreeze in the oil and other than the antifreeze loss it runs great. Does anyone have any ideas? Thanks
The bad EGR valve may have toasted your EGR cooler, or oil cooler both. Either one will cause things to get hot enough to flash boil the coolant.
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Old 07-15-2008, 10:42 AM
BCW BCW is offline
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Maintainlander, Thanks for your reply and info. So how do I test to see if it is the EGR cooler or oil cooler?
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Old 07-15-2008, 10:50 AM
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yes how.....I had my truck in the shop for the EGR valve and now I am losing coolant too
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Old 07-15-2008, 11:01 AM
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sounds like an egr cooler issue. at my dealership they supposedly can run some kind of pressure test to see if it's leaking. not sure if it was a lie or not lol but just an idea
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Old 07-15-2008, 11:19 AM
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For sure the EGR Cooler and or Oil Cooler.

Two options here:
1: Take it in to Ford and have them replace it under warranty and risk the same thing happening again.

2: Get some sort of EGR block or delete kit. The EGR delete pipe can be had for around $200 and can be done in your driveway in an afternoon. The Complete EGR delete system will run you more probably around $600 and will take alittle while longer to install, BUT after the EGR is completely removed you will not have to worry about boiling coolant, no coolant, or puking anymore. Unless the studs go.
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Old 07-15-2008, 11:57 AM
BCW BCW is offline
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Maintainlander, Thanks for your reply and info. So how do I test to see if it is the EGR cooler or oil cooler?
OK, where is the EGR cooler on an 05 F350? Thanks for all the suggestions and help.
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Old 07-15-2008, 12:44 PM
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the egr cooler is under the intake manifold. it really isn't too bad to get too but it is not something that you want to do more than once. the best bet is to go with a block off kit, unless yours is already cracked, in which case i believe you need to fix it or remove it before you can block it. correct me if i'm wrong please.
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Old 07-16-2008, 05:23 AM
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OK, if it is the EGR cooler, where is the antifreeze going? I had to add another gal this morning and still no signs of dripping or leakage and no signs of antifreeze in the motor oil or transmission oil. The Ford dealers have at least a 2 week wait for diagnosing it and this is my only vehicle to drive. Thanks for all of your suggestions and help.
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Old 07-16-2008, 05:36 AM
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I am no expert on this but what I understand to happen is that the coolant actually gets hot enough to flash boil and then leaks out of the pressure cap on the overflow tank. Bascially if the system exceeds around 14psi then it "bubbles" out of the cap. This is why you do not see it in your oil etc. I would think that you would see signs of this around the cap. A tech would be able to tell you a lot more.
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